Shallow-Lake refers to the larger dished depression seasonally appeared in the bottomland of Poyang Lake during the dry season that appears the special characteristics of the topography and hydrologic processes. Under the combined effect of natural and human activities, 102 Dish-Lakes were formed in the estuarine delta formed in Poyang Lake. Based on the study, the lowest elevation of Shallow-Lake is more than 10m. In the wet period, Shallow-Lake integrated with the main body of Poyang Lake as a whole, and in dry period, it becomes relatively independent shallow waters. In the Shallow-Lake, land and water alternating frequently, vegetation fluctuate significantly and biodiversity is very rich. The Shallow-Lake provides feeding and living place for about 80% of the Poyang Lake winter waterfowl, it’s especially suitable for Siberian crane and other rare birds foraging and rest.As part of the international importance wetland, Shallow-Lakes are important for the maintenance of integrity and biodiversity of Poyang Lake wetland ecosystem. Finally, the suggestion on protecting the Shallow-Lake ecosystem is proposed.